Molecular sieves There are many types of aluminium phosphate
molecular sieves, generically known as "ALPOs". The first ones were reported in 1982. They all share the same chemical composition of AlPO4 and have framework structures with microporous cavities. The frameworks are made up of alternating AlO4 and PO4 tetrahedra. The denser cavity-less crystalline
berlinite, shares the same alternating AlO4 and PO4 tetrahedra. These organic molecules act as templates (now termed structure directing agents, SDAs) to direct the growth of the porous framework.
Other Along with
aluminium hydroxide, aluminium phosphate is one of the most common
immunologic adjuvants (efficiency enhancers) in
vaccinations. Aluminium adjuvant use is widespread due to its cheap price, long history of use, safety and efficiency with most
antigens. Similar to aluminium hydroxide, AlPO4 is used as an
antacid. Up to 20% of aluminium from ingested antacid salts can be absorbed from the gastrointestinal tract – despite some unverified concerns about the
neurological effects of aluminium, aluminium phosphate and hydroxide salts are thought to be safe as antacids in normal use, even during pregnancy and breastfeeding. ==Related compounds==